Why can't I horizontally scale a shape in my sequence?
There is an extremely basic thing I need to accomplish: Take a shape and scale it horizontally over-time (to align with a given section), such as in the following example:

Now, I have done this at least five times. But for some reason, I'm flatly unable to accomplish this. So I have either popped a rivet (not impossible) or something subtle has changed. Normally, I would draw out my shape, then set my keyframes and then drag out the two rightmost shape handles to 'fill' the whole line.
But now I find that I can't select individual points on the shape. And I can't scale it horizontally. I have no idea how to do this very basic thing and would love some guidance. This is driving me absolutely insane and costing me too much time.
